Chiropractic mattress, or similar article



FIG. 1 is a top plan view of a chiropractic mattress, or similar article, showing my new design;

FIG. 2 is a side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view; and

FIG. 5 is a bottom plan. 

The ornamental design for a chiropractic mattress, or similar article, as shown. 